2D/3D projector with rotating translucent cylinder for alternating light polarisation

1. A 3D projector comprising: a rotatable hollow cylinder having more than one differently polarizing sections; three digital micromirror devices; and a prism configured to split a light beam into three primary color components and to direct each of the primary color components separately to the three digital micromirror devices; wherein a light beam is capable of being passed generally orthogonally through a wall of the hollow cylinder and wherein the 3D projector projects images that are perceived as 3D images; and wherein the 3D projector has two modes, a 2D mode and a 3D mode, and the projector presents twice the number of frames per second in the 3D mode compared to the 2D mode.

2. The 3D projector according to claim 1 , wherein the light beam is passed through the wall of the hollow cylinder as the hollow cylinder is rotated about a central axis of the hollow cylinder.

3. The 3D projector according to claim 1 , wherein the differently polarizing sections are polarized as either P-polarizing or S-polarizing.

4. The 3D projector according to claim 3 , wherein each P-polarized section is generally circumferentially bounded by S-polarizing sections and each S-polarizing section is generally circumferentially bounded by P-polarizing sections.

5. The 3D projector according to claim 1 , wherein the differently polarizing sections are polarized as either clockwise circular polarizing or counter-clockwise circular polarizing.

6. The 3D projector according to claim 5 , wherein each clockwise circular polarizing section is generally circumferentially bounded by counter-clockwise circular polarizing sections and each counter-clockwise circular polarizing section is generally circumferentially bounded by clockwise circular polarizing sections.

7. The 3D projector according to claim 1 , wherein the polarizing sections are translucent and not color filters.